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Comportement biogéochimique d'antimoine (Sb) et de tellure (Te) dans le milieu côtier : vers des scénarios de dispersion des radionucléides de Sb et de Te en cas de rejets accidentels de centrales nucléaires ArchiMer
Gil-diaz, Teba.
Antimony (Sb) and tellurium (Te) are relatively uncommon contaminants (stable isotopes) and may form short-lived fission products (radionuclides) released into the environment during nuclear power plants accidents. Little is known about their respective biogeochemical behaviours, necessary for general contamination studies and post-accidental radiological risk assessment.This work provides original knowledge on Sb and Te biogeochemical behaviour in highly dynamic continent-ocean transition systems: the Gironde Estuary and the Rhône River. Concentrations, spatial/temporal variations, solid/liquid partitioning (Kd), and fluxes are studied from long-term records at the watershed scale. Four estuarine sampling campaigns during contrasting hydrological...
Tipo: Text Palavras-chave: Antimoine; Tellure; Estuaire de la Gironde; Partition solide/liquide (Kd); Extractions sélectives; Antimony; Tellurium; Gironde Estuary; Solid/liquid partitioning (Kd); Selective extractions.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00607/71891/70592.pdf
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First record of <i>Synidotea laevidorsalis</i> (Miers, 1881) (Crustacea: Isopoda) in Europe (Gironde estuary, France) OMA
Mees, J.; Fockedey, N..
This note reports on the presence of a well established population of the isopod <i>Synidotea laevidorsalis</i> (Miers) in the Gironde estuary (southwestern France). This species is new for the European fauna. <i>S. laevidorsalis</i> is a nonendemic cool-temperate to subtropical, shallow-water species which was probably introduced into the study area from Asia. In the salinity range of 1 to 10 g l<sup>-1</sup> of the Gironde the species constitutes an important component of the brackish-water hyperbenthic community. The population was already present in 1975 when it was misidentified as the native species <i>Idotea emarginata</i> (Fabricius).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Isopoda Synidotea laevidorsalis (Miers; 1881) ANE; France; Gironde Estuary.
Ano: 1993 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2740
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Impact of urban effluents on summer hypoxia in the highly turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment transport and biogeochemical processes ArchiMer
Lajaunie-salla, Katixa; Wild-allen, Karen; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Estuaries are increasingly degraded due to coastal urban development and are prone to hypoxia problems. The macro-tidal Gironde Estuary is characterized by a highly concentrated turbidity maximum zone (TMZ). Field observations show that hypoxia occurs in summer in the TMZ at low river flow and a few days after the spring tide peak. In situ data highlight lower dissolved oxygen (DO) concentrations around the city of Bordeaux, located in the upper estuary. Interactions between multiple factors limit the understanding of the processes controlling the dynamics of hypoxia. A 3D biogeochemical model was developed, coupled with hydrodynamics and a sediment transport model, to assess the contribution of the TMZ and the impact of urban effluents through wastewater...
Tipo: Text Palavras-chave: Hypoxia; TMZ; Gironde Estuary; Wastewater; Oxygen; Modeling.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00388/49903/50475.pdf
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Small-scale variability of zooplankton pyruvate kinase activity in the Gironde Estuary plume (Atlantic French Coast): A case study under unusually low freshwater discharge ArchiMer
Bergeron, Jean-pierre.
Pyruvate kinase (PK) activity measurements are used to assess the role of carbohydrates in global feeding of mesozooplankton communities inhabiting an estuary plume. As a consequence of a remarkably low freshwater discharge rate, the sea surface layers of the area under estuarine influence showed a very moderate salinity fall and a nearly total depletion in nitrates, whereas higher levels of these nutrients were found in deeper, more saline, layers. Small-scale PK activity variations in mesozooplankton appear to be closely correlated to nitrate integration values within the water column. The results were analysed in comparison with literature reports. The study produced a coherent overall interpretation, which strongly supports the reliability of this new...
Tipo: Text Palavras-chave: Gironde Estuary; Bay of Biscay; Pyruvate kinase; Pyruvate kinase; Carbohydrates; Zooplankton; Phytoplankton; Chlorophyll; Inorganic nutrients.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1745.pdf
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Tellurium behaviour in a major European fluvial–estuarine system (Gironde, France): fluxes, solid/liquid partitioning and bioaccumulation in wild oysters ArchiMer
Gil-díaz, Teba; Schäfer, Jörg; Dutruch, Lionel; Bossy, Cécile; Pougnet, Frédérique; Abdou, Melina; Lerat-hardy, Antoine; Pereto, Clément; Derriennic, Hervé; Briant, Nicolas; Sireau, Teddy; Knoery, Joel; Blanc, Gerard.
Tellurium (Te) is a technology critical element (TCE) with largely unknown environmental behaviour, especially in continent-ocean interface systems. The unknown behaviour results from the lack of studies in aquatic environments and from analytical challenges limiting the determination of its naturally low (ultra-trace) environmental levels. We performed a comprehensive study of Te in the Lot–Garonne–Gironde fluvial–estuarine system to better understand seasonal variations, solid/liquid partitioning (Kd), gross fluxes, estuarine dynamics, and transfer to wild oysters at the estuary mouth. A temporal record (2014–2017) of dissolved (Ted) and particulate (Tep) Te concentrations at five sites in the Lot–Garonne River system shows little differences between...
Tipo: Text Palavras-chave: Garonne River; Gironde Estuary; Lot River; RNO; ROCCH; Technology critical element.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61684/65639.pdf
Registros recuperados: 5
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